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Spire
Structure on top of a roof, skyscraper or tower / From Wikipedia, the free encyclopedia
A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples.[1] A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape.[1] Spires are typically made of stonework or brickwork, or else of timber structures with metal cladding, ceramic tiling, roof shingles, or slates on the exterior.[1]
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Since towers supporting spires are usually square, square-plan spires emerge directly from the tower's walls, but octagonal spires are either built for a pyramidal transition section called a broach at the spire's base, or else freed spaces around the tower's summit for decorative elements like pinnacles.[1] The former solution is known as a broach spire.[1] Small or short spires are known as spikes, spirelets, or flèches.[1][2]